Arc self-cleaning duct

Abstract

The utility model provides a kind of arc structure self-cleaning pipeline, including at least one layer pipe wall, the cross section of one layer pipe wall of arc structure self-cleaning pipeline includes: first opening structure, when arc structure self-cleaning pipeline in laying after state, first opening structure is located in the side of arc structure self-cleaning pipeline away from geocenter;Second opening structure, when arc structure self-cleaning pipeline in laying after state, second opening structure is located in the side of arc structure self-cleaning pipeline close to geocenter;Connecting structure, first opening structure is connected with second opening structure by connecting structure, and form closed shape;Wherein, first projection area is greater than second projection area, first projection area is the projection area of the closed region of first opening structure on cross section, and second projection area is the projection area of the closed region of second opening structure on cross section.The utility model can effectively improve the scouring effect of liquid on second opening structure, reduce the risk of blockage, reduce maintenance and / or repair cost.

Description

Technical Field

[0001] This utility model relates to the field of polymer pipe technology, and in particular to an arc-shaped self-cleaning pipe. Background Technology

[0002] With the acceleration of urbanization, the demand for water and the amount of sewage generated are constantly increasing, and the requirements for environmental protection and public health are also increasing. This has prompted the continuous improvement and expansion of water supply and sewage pipeline systems, forming today's complex and huge pipeline network system, including household connection pipes, community branch pipes, community trunk pipes, community main pipes, and ancillary structures such as inspection wells and pumping stations.

[0003] Taking sewage pipe systems as an example, sewage may contain various solid impurities, grease, chemical reactants, etc., which easily settle and accumulate in the pipes, leading to blockages. Current technologies require regular cleaning and dredging of sewage pipes to solve this problem, resulting in high maintenance costs and a large workload. Therefore, existing technologies lack a pipe design that can effectively reduce sediment accumulation and lower maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide an arc-shaped self-cleaning pipe with a specific shape. The specific shape of the arc-shaped self-cleaning pipe can increase the liquid flow rate in areas of the pipe that are prone to deposits or residues, effectively improving the problem of deposits or residues on the inner wall of the pipe, thereby effectively reducing maintenance costs.

[0005] On one hand, this utility model provides an arc-shaped self-cleaning pipe, including at least one pipe wall. The cross-section of the first pipe wall includes a first opening structure, a second opening structure, and a connecting structure. When the arc-shaped self-cleaning pipe is laid, the first opening structure is located on the side of the arc-shaped self-cleaning pipe furthest from the Earth's center; the second opening structure is located on the side of the arc-shaped self-cleaning pipe closest to the Earth's center. The first opening structure is connected to the second opening structure through the connecting structure, forming a closed shape. The first projected area is larger than the second projected area; the first projected area is the projected area of ​​the closed region of the first opening structure on the cross-section, and the second projected area is the projected area of ​​the closed region of the second opening structure on the cross-section.

[0006] According to one embodiment of the present invention, the first opening structure is a horizontally symmetrical structure; the second opening structure is a horizontally symmetrical structure; the connecting structure includes two horizontally symmetrical and separately arranged sub-connecting structures, the two ends of each sub-connecting structure being connected to one end of the first opening structure and one end of the second opening structure, respectively.

[0007] According to one embodiment of the present invention, the first opening structure is any one or a combination of a circular arc structure, an elliptical arc structure, and a polygonal opening structure; the second opening structure is any one or a combination of a circular arc structure, an elliptical arc structure, and a polygonal opening structure.

[0008] According to one embodiment of the present invention, the opening size of the second opening structure is smaller than the opening size of the first opening structure; the edges of the polygonal opening structure are connected with rounded corners.

[0009] According to one embodiment of the present invention, the second opening structure includes at least one concave shape facing the first opening, and liquid flow acceleration structures are formed on both sides of the concave shape; and / or the second opening structure includes at least one convex shape in a direction away from the first opening, the convex shape forming the liquid flow acceleration structure.

[0010] According to one embodiment of the present invention, the ratio of the size of the concave opening to the size of the first opening is less than 50%; the ratio of the size of the convex opening to the size of the first opening is less than 50%.

[0011] According to one embodiment of the present invention, the arc-shaped self-cleaning pipe retains its shape on at least one side after it is laid, or deforms toward the axis of the arc-shaped self-cleaning pipe.

[0012] According to one embodiment of the present invention, the connection structure includes a first sub-connection structure and a second sub-connection structure; the first sub-connection structure and the second sub-connection structure are straight structures or curved structures that bend toward each other, and when the arc-shaped self-cleaning pipe is subjected to external force, the distance between the first sub-connection structure and the second sub-connection structure is at least partially reduced.

[0013] According to one embodiment of the present invention, at least one layer of the pipe wall near the pipe axis is a low-friction layer, and the friction coefficient of the low-friction layer is ≤0.15; the low-friction layer is an ultra-high molecular weight polymer layer.

[0014] According to one embodiment of the present invention, when the arc-shaped self-cleaning pipe is laid, the support structure is located on the side of the second opening structure closer to the center of the earth; wherein, the support structure is integrally formed with the second opening structure, or the support structure is fixed on the second opening structure after the second opening structure is formed.

[0015] According to one embodiment of the present invention, the support structure includes a first sub-support structure and a second sub-support structure, which are respectively disposed on both sides of the second opening structure; or the support structure includes a grounding component and a connecting component, wherein the grounding component is an inclined surface or a surface with a preset curvature, the preset curvature being less than the curvature of the second opening structure, and the two ends of the connecting component are respectively connected to the grounding component and the first opening structure.

[0016] According to one embodiment of the present invention, the maximum cross-sectional dimension of the arc-shaped self-cleaning pipe can be greater than or equal to 200 mm (e.g., 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 1000 mm, 1500 mm, 2000 mm, 2500 mm, 3000 mm); at least one pipe wall also includes: a wide-gauge material layer, disposed on the side of the low-friction layer away from the axis of the pipe, and the ratio of the thickness of the wide-gauge material layer to the wall thickness of the arc-shaped self-cleaning pipe can be greater than or equal to 50%, such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc.

[0017] According to one embodiment of the present invention, at least one pipe wall further includes: an auxiliary forming layer located between the low-friction layer and the wide-gauge material layer; the material of the auxiliary forming layer includes a polymer and additives; the low-friction layer is formed by sintering low-friction material powder attached to the side of the auxiliary forming layer near the pipe axis; the low-friction material powder and the auxiliary forming layer in a hot-melt state are co-extruded; the polymer has a molecular weight greater than 1 million, such as 1.01 million, 2 million, 3 million or 4 million; the thickness of the low-friction layer is less than 30 mm; and 0.03≤M≤0.15, where M is the coefficient of friction; and / or an outer wall layer exposed on the outer surface of the arc-shaped self-cleaning pipe.

[0018] According to one embodiment of the present invention, the arc-shaped self-cleaning pipe has any of the following structures: the arc-shaped self-cleaning pipe is a double-wall corrugated pipe, the double-wall corrugated pipe includes a first pipe wall and a second pipe wall, the first pipe wall is located on the side of the second pipe wall closer to the pipe axis; the arc-shaped self-cleaning pipe is a single-wall corrugated pipe; the arc-shaped self-cleaning pipe can also be a spiral wound pipe; the arc-shaped self-cleaning pipe is a special-shaped pipe; the arc-shaped self-cleaning pipe is a single-layer solid wall pipe, and / or a multi-layer solid wall pipe.

[0019] The arc-shaped self-cleaning pipe provided by this utility model has a first cross-sectional area larger than a second cross-sectional area. The first cross-sectional area is the area of ​​the half-section of the arc-shaped self-cleaning pipe on the side furthest from the Earth's center after installation, and the second cross-sectional area is the area of ​​the half-section of the arc-shaped self-cleaning pipe on the side closest to the Earth's center after installation. Therefore, at a certain time point, the flow velocity of the liquid in the first cross-sectional area is less than the flow velocity of the liquid in the second cross-sectional area, that is, the flow velocity of the liquid at the bottom of the arc-shaped self-cleaning pipe is higher than the flow velocity of the liquid in the middle of the arc-shaped self-cleaning pipe. This special mechanical structure accelerates the flow velocity of the liquid at the bottom of the pipe, helping to flush away contaminants deposited and attached to the bottom of the pipe, reducing the risk of blockage inside the pipe, and thus reducing the maintenance and repair costs of the pipe system.

[0020] In some embodiments, by optimizing the geometric design of the pipe shape, the sidewalls of the pipe will not bend outward under its own weight or the action of soil cover, thus preventing the bottom flow channel from widening and reducing the liquid flow velocity. This allows the inner flow channel to maintain good self-cleaning performance continuously.

[0021] In some embodiments, the upper part of the pipe has a polygonal opening structure. Through the transition between the upper and lower structures and the combination of arc design, the strength and pressure resistance of the upper part of the pipe can be improved, and an internal flow channel can be formed at the bottom of the pipe to accelerate the flow of liquid. This provides a greater water flow impact force for attachments such as branches and algae, reducing the risk of pipe blockage.

[0022] In some embodiments, the lower part of the pipe has one or more raised shapes, and the groove structures on both sides of these raised shapes form liquid acceleration channels, which helps to further accelerate the liquid flow rate in areas prone to deposition or adhesion, reducing the risk of deposition or adhesion. Furthermore, the one or more raised shapes at the bottom of the pipe can effectively support debris such as tree branches, preventing them from sinking to the bottom. The smaller distribution of grooved flow channels at the bottom allows the pipe to achieve localized liquid acceleration at lower flow rates, ensuring self-cleaning performance. In addition, this design further improves the pipe's load-bearing capacity and resistance to deformation.

[0023] In some embodiments, a low-friction layer is also provided on the inner surface of the pipe, which can further reduce the occurrence of deposition and adhesion.

[0024] In some embodiments, the low-friction layer is formed by sintering low-friction material powder attached to the side of the auxiliary forming layer near the tube axis. This can improve the manufacturing efficiency of the low-friction layer with the help of the auxiliary forming layer and significantly reduce the time cost of production.

[0025] In some embodiments, compared to existing high-density polyethylene (HDPE) solid-wall pipe end-face welding, self-cleaning multilayer composite pipes with an ultra-high molecular weight polyethylene (UHMWPE) inner layer do not have molten material flanges on the inner surface of the pipe during end-face welding, whereas existing HDPE solid-wall pipes have molten material flanges on the inner surface after end-face welding. When pipes with an UHMWPE inner layer are used for end-face welding, the slow-flowing UHMWPE inner layer prevents molten material from flowing to the inner surface of the pipe, thus creating a pipeline without molten material flanges on the inner surface, thereby preventing scale buildup at the connection point on the inner surface of the pipe.

[0026] The adoption of this new type of pipe greatly facilitates the maintenance of urban drainage systems and significantly improves the self-cleaning efficiency of the pipes. It not only plays a vital role in environmental protection but also demonstrates significant economic benefits in municipal infrastructure maintenance, providing strong technical support for the sustainable development of cities. Attached Figure Description

[0027] Figure 1 A schematic diagram of the cross-section of an arc-shaped self-cleaning pipe is shown;

[0028] Figure 2 Show Figure 1 A schematic diagram showing the deformation of the arc-shaped self-cleaning pipe under gravity.

[0029] Figure 3A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0030] Figure 3B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0031] Figure 4 Show Figure 3A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0032] Figure 5 Show Figure 3A A schematic diagram showing the deformation of the arc-shaped self-cleaning pipe under gravity.

[0033] Figure 6A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0034] Figure 6B , Figure 6C and Figure 6D A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0035] Figure 7 Show Figure 6A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0036] Figure 8AA schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0037] Figure 8B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0038] Figure 9 Show Figure 8A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0039] Figure 10 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0040] Figure 11 Show Figure 10 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0041] Figure 12 Show Figure 10 A schematic diagram showing the deformation of the arc-shaped self-cleaning pipe under gravity.

[0042] Figure 13 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0043] Figure 14 Show Figure 13 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0044] Figure 15 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0045] Figure 16 Show Figure 15 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0046] Figure 17 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0047] Figure 18 Show Figure 17 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0048] Figure 19 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0049] Figure 20 Show Figure 19 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0050] Figure 21 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0051] Figure 22 Show Figure 21 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0052] Figure 23 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0053] Figure 24 Show Figure 23 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0054] Figure 25 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0055] Figure 26 Show Figure 25 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0056] Figure 27 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0057] Figure 28 Show Figure 27 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0058] Figure 29A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0059] Figure 29B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0060] Figure 30 Show Figure 29A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0061] Figure 31A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0062] Figure 31B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0063] Figure 32 Show Figure 31A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0064] Figure 33 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0065] Figure 34 Show Figure 33 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0066] Figure 35 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown;

[0067] Figure 36 Show Figure 35A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown;

[0068] Figure 37 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with a supporting structure is shown.

[0069] Figure 38 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with a support structure is shown.

[0070] Figure 39 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with a support structure is shown.

[0071] Figure 40 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with a support structure is shown.

[0072] Figure 41 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with a support structure is shown.

[0073] Figure 42 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with a support structure is shown.

[0074] Figure 43 A partial cross-sectional schematic diagram of the double-layered pipe wall of the arc-shaped self-cleaning pipe is shown;

[0075] Figure 44 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0076] Figure 45A A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0077] Figure 45B A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0078] Figure 46 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0079] Figure 47 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0080] Figure 48 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0081] Figure 49 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0082] Figure 50 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0083] Figure 51 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0084] Figure 52 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0085] Figure 53 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown.

[0086] Figure 54 A partial cross-sectional schematic diagram of the four layers of the wall of the arc-shaped self-cleaning pipe is shown;

[0087] Figure 55 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with four layers of pipe wall is shown.

[0088] Figure 56 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with four layers of pipe wall is shown.

[0089] Figure 57 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with four layers of pipe wall is shown.

[0090] Figure 58 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with four layers of wall is shown; and

[0091] Figure 59 A schematic diagram showing the loading force on the pipe is provided. Detailed Implementation

[0092] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. While only preferred embodiments of the present invention have been described in detail, it should be understood that the scope of the present invention is not limited to the details of the construction and arrangement of the components set forth in the following description or shown in the drawings. The present invention can have other embodiments and can be practiced or carried out in a variety of ways.

[0093] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0094] It should be understood that although the terms "first," "second," "third," etc., may be used in this utility model to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0095] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0096] For example, the term “co-extrusion” as used herein is used according to their generally accepted definition, which refers to a single-step process that begins with two or more polymer materials and simultaneously extrudes and shapes them in a single die to form multilayer tubes or sheets.

[0097] To facilitate understanding of the technical solution of this application, the current state of development in the field of pipe technology will first be introduced and explained. This utility model is described based on the following facts.

[0098] Pipeline blockage, especially in sewage pipes, is a common and complex problem in pipe networks, which can be caused by at least one of the following factors: silt deposition, debris accumulation, grease adhesion and coagulation, and chemical reaction precipitation. Debris accumulation can be caused by: household waste mixing in, construction waste, or tree roots penetrating pipe joints.

[0099] For example, in daily life, some large or non-biodegradable items, such as plastic bottles, sanitary napkins, and wet wipes, are mistakenly discharged into sewage pipes. These items cannot degrade naturally in the pipes and gradually accumulate as water flows through bends, changes in pipe diameter, or areas where the flow rate slows, eventually leading to blockages. Residents of some older communities have a weak sense of environmental protection and carelessly discard trash, which can easily cause pipe blockages over time. Furthermore, during construction, if the construction company is not well-managed, construction waste such as concrete blocks, bricks, and gravel may enter the sewage pipes. These large and heavy wastes easily accumulate at the bottom of the pipes, obstructing the normal flow of sewage. When construction is underway around new residential areas, if the construction company fails to properly treat wastewater discharge, construction waste can flow into the community's sewage pipes, causing blockages.

[0100] For example, restaurant wastewater discharge: Large amounts of oily wastewater from restaurants, canteens, and other catering establishments are discharged directly into sewage pipes without effective treatment. As the water temperature decreases inside the pipes, the grease gradually solidifies, adhering to the inner walls and forming a thick layer of grease. This not only reduces the pipe's cross-sectional area but also absorbs other impurities from the wastewater, further exacerbating pipe blockage. In many older urban areas, where restaurants are concentrated and effective grease traps are not installed, sewage pipes are frequently blocked due to grease buildup.

[0101] In addition, pipe damage and deformation: Sewage pipes are subject to long-term external pressure, foundation settlement, corrosion, and other factors, which may lead to damage and deformation. Inadequate sealing at pipe joints allows surrounding soil and tree roots to enter the pipes; localized grooves or protrusions in the pipes can alter the sewage flow velocity, easily causing debris accumulation. Some sewage pipes that have been laid for a long time may experience ruptures and deformations due to changes in groundwater levels and the impact of construction on surrounding buildings, leading to blockages.

[0102] In addition, chemical reactions and precipitation are also a cause of pipe blockage: industrial wastewater contains a large number of chemical substances, such as heavy metal ions, acids, and alkalis. When different types of industrial wastewater are mixed, or when mixed with domestic sewage, chemical reactions may occur, generating precipitates. These precipitates accumulate in the pipes, causing blockages. Sewage pipes around chemical industrial parks frequently experience blockages due to chemical precipitation because they receive various types of industrial wastewater.

[0103] Current technologies for addressing pipe clogging issues primarily employ proactive maintenance in municipal pipeline maintenance. This includes regular maintenance of main pipelines, manual repairs after clogging occurs, and the use of proactive cleaning equipment for daily inspections. For high-value-added product pipelines, specialized materials can be used to reduce the risk of clogging. For example, oil pipelines can utilize chemically stable materials with low friction coefficients. However, taking ultra-high molecular weight polyethylene (UHMWPE) as an example, its material cost is significantly higher than that of ordinary polymer pipes. In particular, the viscosity of molten UHMWPE is extremely high, resulting in a molding efficiency only about 1% of that of ordinary plastic pipes, hindering its widespread adoption and large-scale application.

[0104] The embodiments of this utility model, by designing an irregularly shaped pipe structure, accelerate the liquid flow speed at the bottom of the pipe, enhance the flushing force of the liquid flow on areas prone to sedimentation, and effectively reduce the risk of pipe blockage.

[0105] Furthermore, by modifying the pipe structure, the pressure-bearing capacity of the pipe can be effectively increased. Moreover, even if the pipe deforms under stress, the effect of accelerating liquid flow at the bottom of the pipe will not be diminished.

[0106] Furthermore, the inner surface of the pipe wall is made of a material with a low coefficient of friction, which reduces the friction coefficient of the inner surface of the pipe, thereby reducing the possibility of blockage caused by sedimentation and accumulation inside the pipe. Since some low-friction materials are much more expensive than ordinary pipe materials, the multi-layer arc-structured self-cleaning pipe can effectively reduce the consumption of expensive low-friction layer materials, thus effectively reducing the raw material cost of the pipe.

[0107] In some embodiments, in order to increase the stability of the arc-shaped self-cleaning pipe, by adding wide-gauge material to the pipe wall, the pipe wall strength can be effectively increased without significantly increasing the pipe weight, thus improving the pipe deformation problem and further reducing the pipe maintenance cost.

[0108] Figure 1 A schematic diagram of the cross-section of an arc-shaped self-cleaning pipe is shown;

[0109] See Figure 1 The diagram illustrates an arc-shaped self-cleaning pipe, comprising at least one pipe wall, wherein the cross-section of the first pipe wall of the arc-shaped self-cleaning pipe comprises: a first opening structure 1, a second opening structure 2, and a connecting structure 3.

[0110] In this configuration, when the arc-shaped self-cleaning pipe is laid, the first opening structure 1 is located on the side of the arc-shaped self-cleaning pipe furthest from the Earth's center; the second opening structure 2 is located on the side of the arc-shaped self-cleaning pipe closest to the Earth's center. A connecting structure 3 connects the first opening structure 1 to the second opening structure 2, forming a closed shape. The first projected area is larger than the second projected area; the first projected area is the projected area of ​​the closed region of the first opening structure 1 on its cross-section, and the second projected area is the projected area of ​​the closed region of the second opening structure 2 on its cross-section.

[0111] In some embodiments, the opening size of the second opening structure is smaller than that of the first opening structure. The joints between the sides of the polygonal opening structure can be rounded or pointed. Rounded corner joints help improve the robustness of the mechanical structure.

[0112] In some embodiments, the connection structure 3 includes a first sub-connection structure and a second sub-connection structure.

[0113] See Figure 1Since the first cross-sectional area of ​​the arc-shaped self-cleaning pipe is larger than the second cross-sectional area, the first cross-sectional area is the area of ​​the half-section of the arc-shaped self-cleaning pipe on the side away from the Earth's center after installation, and the second cross-sectional area is the area of ​​the half-section of the arc-shaped self-cleaning pipe on the side closer to the Earth's center after installation. The half-section can be an area taken from half the pipe's dimensions. Because the second projected area is smaller than the first projected area and smaller than the projected area of ​​the area where the connecting structure 3 is located, according to fluid dynamics simulation results, the liquid flow velocity is highest in the area of ​​the second opening structure 2 when the liquid flows through the pipe, and sediment is most likely to adhere to the bottom of the pipe. The higher flow velocity of the water can effectively flush the surface of the second opening structure 2, reducing the risk of sediment adhering to the pipe, as shown in Tables 8 and 9 below.

[0114] Figure 2 This diagram illustrates the deformation of an arc-shaped self-cleaning pipe under gravity. The force acting on the pipe is represented by F, which includes the force exerted by the soil cover and its own weight. Figure 2 The pipe shown is an arc-shaped self-cleaning pipe. Under the action of force F, the slightly outward-curving pipe wall becomes more outward-curving, such as the curvature of the side of the pipe closer to the Earth's center decreasing. This may cause the special properties of the arc-shaped self-cleaning pipe (such as the accelerated liquid flow velocity at the bottom of the pipe) to weaken or disappear.

[0115] To address the above issues, this embodiment provides a pipe structure with a straight wall.

[0116] In some embodiments, the first opening structure is a horizontally symmetrical structure. The second opening structure is a horizontally symmetrical structure. The connecting structure includes two horizontally symmetrical and separately arranged sub-connecting structures, each of which has its two ends connected to one end of the first opening structure and the corresponding end of the second opening structure, respectively.

[0117] In some embodiments, the first opening structure is any one or a combination of a circular arc structure, an elliptical arc structure, and a polygonal opening structure. The second opening structure is any one or a combination of a circular arc structure, an elliptical arc structure, and a polygonal opening structure. The first sub-connecting structure and the second sub-connecting structure are straight line structures.

[0118] Figure 3A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 3B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 4 Show Figure 3A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 3A and Figure 4 The first opening structure 1 and the second opening structure 2 are both arc-shaped, and the connecting structure between the first opening structure 1 and the second opening structure 2 is a straight wall. Figure 5Show Figure 3A The diagram shows the deformation of the arc-shaped self-cleaning pipe under gravity. (See attached image.) Figure 5 This effectively reduces the deformation of the connecting structure 3 under stress, or causes the connecting structure 3 to bend towards the pipe axis, without causing the liquid flow acceleration effect to disappear or weaken. See also Figure 3B The inner and outer walls of the pipe can be conformal or non-conformal, such as Figure 3B The outer wall of the second opening is flatter than the inner wall, facilitating the pipe's upright placement on the mounting surface. When liquid flows through the pipe, the flow velocity within the first cross-sectional area is lower than that within the second cross-sectional area; that is, the liquid velocity at the bottom of the arc-shaped self-cleaning pipe is higher than that in the middle. A special mechanical structure accelerates the liquid at the bottom of the pipe, flushing away deposits and contaminants adhering to the bottom.

[0119] In some embodiments, a liquid flow acceleration structure can be provided at the bottom of the pipe to further accelerate the flow rate of the liquid in the bottom region of the pipe.

[0120] For example, the second opening structure includes at least one concave shape facing the first opening, with liquid flow acceleration structures formed on both sides of the concave shape (also called a groove shape).

[0121] For example, the second opening structure includes at least one protruding shape in a direction away from the first opening, the cross-sectional area of ​​which is much smaller than the cross-sectional area of ​​the first opening structure, and the protruding shape forms a liquid flow acceleration structure.

[0122] Figure 6A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 6B , Figure 6C and Figure 6D A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 7 Show Figure 6A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 6A and Figure 7 The bottom of the pipe has a raised shape 21, and correspondingly, concave shapes 22 are formed on both sides of the raised shape, which form a liquid flow acceleration structure. See also Figure 6B The inner and outer walls of the pipe can be conformal or non-conformal, such as Figure 6B The outer wall of the second opening is approximately flat to facilitate the pipe standing upright on the mounting surface and to increase strength.

[0123] In addition, see Figure 6C , Figure 6DThe outermost wall of the pipe, on the side closest to the Earth's center and / or the side furthest from the Earth's center, has a planar structure to facilitate installation and transportation. The connecting structure 3 is a convex curved structure, and the second opening structure includes one protruding shape 21 and two concave shapes 22 located on either side of the protruding shape 21. The bottom region of the pipe includes two protruding shapes and three concave shapes, which form three liquid flow acceleration structures to facilitate fluid acceleration at low flow rates.

[0124] It should be noted that the number of the above-mentioned protruding and concave shapes can be one, two, three or more, and there is no limitation here.

[0125] Figure 8A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 8B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 9 Show Figure 8A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 8A and Figure 9 The bottom region of the pipe includes two raised shapes and three concave shapes, which form three liquid flow acceleration structures. See also Figure 8B The inner and outer walls of the pipe can be conformal or non-conformal, such as Figure 8B The outer wall of the second opening is approximately flat to facilitate the pipe standing upright on the mounting surface and to increase strength.

[0126] In some embodiments, the connection structure 3 described above can be a straight surface or a curved surface that bends toward the axis of the pipe.

[0127] Figure 10 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 11 Show Figure 10 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe shown; Figure 12 Show Figure 10 The diagram shows the deformation of the arc-shaped self-cleaning pipe under gravity. (See attached diagram.) Figure 10 and Figure 11 The aforementioned connection structure 3 is a curved surface that bends slightly inward toward the inside of the pipe. See also... Figure 12 This allows the connecting structure 3 to bend towards the pipe axis under stress, preventing the liquid flow acceleration effect from disappearing or weakening.

[0128] Figure 13 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 14 Show Figure 13 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 13 and Figure 14 ,exist Figure 10In addition, concave or convex shapes can be formed at the bottom of the pipe to accelerate the liquid flow rate in that area and enhance the scouring force of the liquid flow.

[0129] Figure 15 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 16 Show Figure 15 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 15 and Figure 16 The number of concave shapes 22 or convex shapes 21 at the bottom of the pipe can be one or more, and there is no limitation here.

[0130] In some embodiments, the first opening structure 1 may also be a polygon, and the first opening structure 1 and the connecting structure 3 may be connected by a sharp corner or a rounded arc.

[0131] Figure 17 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 18 Show Figure 17 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 17 and Figure 18 The first opening structure is a triangle. For example, this triangle can be three adjacent sides of a regular hexagon, or it can be the three sides of an isosceles trapezoid other than the base; there are no restrictions here. The connecting structure 3 is a straight surface, and the second opening structure 2 is an arc.

[0132] Figure 19 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 20 Show Figure 19 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 19 and Figure 20 The first opening structure is a triangle. For example, the triangle can be the three adjacent sides of a regular hexagon, or it can be the three sides of an isosceles trapezoid other than the base. The connecting structure 3 is a straight surface, and the second opening structure includes a protruding shape 21 and two concave shapes 22 located on both sides of the protruding shape 21.

[0133] Figure 21 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 22 Show Figure 21 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 21 and Figure 22 The bottom area of ​​the pipe includes two raised shapes and three concave shapes, which form three liquid flow acceleration structures.

[0134] In some embodiments, the arc-shaped self-cleaning pipe retains the shape of at least one side of the pipe wall after it is laid, or deforms toward the axis of the arc-shaped self-cleaning pipe.

[0135] For example, the first and second sub-connecting structures are curved structures that bend toward each other. When the arc-shaped self-cleaning pipe is subjected to external force, the distance between the first and second sub-connecting structures decreases at least partially.

[0136] Figure 23 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 24 Show Figure 23 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 23 and Figure 24 The first opening structure 1 is a triangle. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the pipe. The second opening structure 2 is an arc.

[0137] Figure 25 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 26 Show Figure 25 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 25 and Figure 26 The first opening structure 1 is triangular. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the pipe. The second opening structure 2 includes a protruding shape 21 and two concave shapes 22 located on both sides of the protruding shape 21.

[0138] Figure 27 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 28 Show Figure 27 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 27 and Figure 28 The first opening structure 1 is triangular. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the pipe. The second opening structure 2 includes two protruding shapes 21 and three concave shapes 22.

[0139] Figure 29A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 29B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 30 Show Figure 29A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 29A and Figure 30 The first opening structure 1 is a special shape formed by two straight edges connected by an arc. The connecting structure 3 is an inclined plane. The second opening structure 2 is an arc. See also... Figure 29B The inner and outer walls of the pipe can be conformal or non-conformal, such as Figure 29BThe outer wall of the second opening is approximately flat to facilitate the pipe standing upright on the mounting surface and to increase strength.

[0140] Figure 31A A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 31B A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 32 Show Figure 31A A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 31A and Figure 32 The first opening structure 1 is a special shape formed by two straight edges connected by an arc. The connecting structure 3 is a straight surface. The second opening structure 2 includes a protruding shape 21 and two concave shapes 22 located on both sides of the protruding shape 21. See also... Figure 31B The inner and outer walls of the pipe can be conformal or non-conformal, such as Figure 31B The outer walls of the top of the first opening and the bottom of the second opening are approximately flat to facilitate the pipe standing upright on the mounting surface and to increase strength. Furthermore, the pipe can be a single-layer or multi-layer composite structure, such as a pipe cross-section comprising multiple stacked layers, with at least two layers made of different materials.

[0141] Figure 33 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 34 Show Figure 33 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 33 and Figure 34 The first opening structure 1 is a special shape consisting of two straight edges connected by an arc. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the pipe. The second opening structure 2 is an arc.

[0142] Figure 35 A schematic diagram of the cross-section of another arc-shaped self-cleaning pipe is shown; Figure 36 Show Figure 35 A three-dimensional schematic diagram of the arc-shaped self-cleaning pipe is shown. (See also...) Figure 35 and Figure 36 The first opening structure 1 is a special shape consisting of two straight edges connected by an arc. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the tube. The second opening structure 2 includes a protruding shape 21 and two concave shapes 22 located on both sides of the protruding shape 21.

[0143] In some embodiments, the ratio of the size of the concave opening to the size of the first opening is less than 50%.

[0144] In some embodiments, the ratio of the size of the protruding opening to the size of the first opening is less than 50%.

[0145] In some embodiments, the aforementioned arc-shaped self-cleaning pipe may further include a support structure, which is disposed on the side of the second opening structure closer to the Earth's center when the arc-shaped self-cleaning pipe is laid. The support structure is integrally formed with the second opening structure, or the support structure is fixed to the second opening structure after the second opening structure is formed.

[0146] In some embodiments, the support structure includes a first sub-support structure and a second sub-support structure, which are respectively disposed on both sides of the second opening structure; or

[0147] The support structure includes a grounding component and a connecting component. The grounding component is a plane or a surface with a preset curvature, the preset curvature being less than the curvature of the second opening structure. The two ends of the connecting component are respectively connected to the grounding component and the first opening structure.

[0148] Figure 37 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with a supporting structure is shown. (See attached diagram) Figure 37 The first opening structure 1 and the second opening structure 2 are both arc-shaped, and the connecting structure between the first opening structure 1 and the second opening structure 2 is a straight wall. A sub-support structure 4 is provided on each side of the second opening structure 2, and the two sub-support structures 4 can form a plane for contact with the ground during installation.

[0149] Figure 38 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with a supporting structure is shown. (See attached diagram) Figure 38 The first opening structure 1 and the second opening structure 2 are both arc-shaped, and the connecting structure 3 between the first opening structure 1 and the second opening structure 2 is a curved surface that is slightly bent inward towards the inside of the pipe. A sub-support structure 4 is provided on each side of the second opening structure 2, and the two sub-support structures 4 can form a plane for contact with the ground during installation.

[0150] Figure 39 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with a supporting structure is shown. (See attached diagram) Figure 39 The first opening structure 1 is a triangle. For example, this triangle can be three adjacent sides of a regular hexagon, or it can be the three sides of an isosceles trapezoid other than the base; there is no limitation here. The connecting structure 3 is a straight surface, and the second opening structure 2 is an arc. A sub-support structure 4 is provided on each side of the second opening structure 2. The two sub-support structures 4 can form a plane for contact with the ground during installation.

[0151] Figure 40 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with a supporting structure is shown. (See attached diagram) Figure 40The first opening structure 1 is a triangle. For example, this triangle can be three adjacent sides of a regular hexagon, or it can be the three sides of an isosceles trapezoid excluding the base; there is no limitation here. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the pipe, and the second opening structure 2 is an arc. A sub-support structure 4 is provided on each side of the second opening structure 2, and the two sub-support structures 4 can form a plane for contact with the ground during installation.

[0152] Figure 41 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with a supporting structure is shown. (See attached diagram) Figure 41 The first opening structure 1 is a special shape consisting of two straight edges connected by an arc. The connecting structure 3 is a straight surface, and the second opening structure 2 is an arc. A sub-support structure 4 is provided on each side of the second opening structure 2. The two sub-support structures 4 can form a plane for contact with the ground during installation.

[0153] Figure 42 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with a supporting structure is shown. (See attached diagram) Figure 42 The first opening structure 1 is a special shape consisting of two straight edges connected by an arc. The connecting structure 3 is a curved surface that curves slightly inward toward the inside of the pipe, and the second opening structure 2 is an arc. A sub-support structure 4 is provided on each side of the second opening structure 2, and the two sub-support structures 4 can form a plane for contact with the ground during installation.

[0154] In some embodiments, the pipe wall of the irregularly shaped pipe has a composite structure, which makes the arc-shaped self-cleaning pipe suitable for more scenarios.

[0155] In some embodiments, at least one layer of the pipe wall near the pipe axis is a low-friction layer with a friction coefficient <0.15. The low-friction layer is an ultra-high molecular weight polymer layer.

[0156] Figure 43 This diagram shows a partial cross-sectional view of the double-walled structure of an arc-shaped self-cleaning pipe. (See also...) Figure 43 The following example illustrates a two-layer composite structure. Ultra-high molecular weight polyethylene (UHMWPE) is the most commonly used ultra-high molecular weight polymer. UHMWPE pipes are widely used in many fields due to their excellent properties such as wear resistance and chemical corrosion resistance. There are various manufacturing methods, each with its own characteristics in terms of production efficiency. The following provides an illustrative description of several manufacturing methods and their production efficiency characteristics.

[0157] Extrusion Molding: UHMWPE raw material is fed into the extruder hopper and, driven by the screw, enters the barrel. An external heating device heats the raw material, gradually melting and plasticizing it. The plasticized material is then extruded through a die of a specific shape under the screw's pressure, forming a preliminary pipe shape. Subsequently, a cooling device cools and solidifies the extruded pipe into the desired pipe product.

[0158] Extrusion molding is suitable for continuous production, and mass production can be achieved with automated feeding, cooling, and traction devices. However, UHMWPE melt has high viscosity and poor flowability, requiring higher extrusion pressure, which may limit the extrusion speed. Furthermore, changing to different pipe specifications requires replacing components such as dies, which consumes time and affects production efficiency. For example, some large-scale pipe manufacturers use advanced extrusion production lines that can produce several meters to tens of meters of pipe per hour. This capacity, compared to the production efficiency of ordinary polyethylene pipes, cannot meet the large market demand for standard-sized pipes.

[0159] Alternatively, compression molding can be used: a certain amount of UHMWPE powder or preformed blank is placed into the mold cavity. After the mold is closed, it is held at a certain temperature and pressure for a period of time, allowing the material to melt and flow within the mold and fill the cavity, forming a pipe shape. Afterward, the mold cools, the pipe solidifies, and the mold is opened to remove the formed pipe. However, compression molding has relatively low production efficiency and is usually intermittent. Each molding process requires multiple steps, including loading, mold closing, heating and pressurizing, cooling and demolding, making the entire process time-consuming.

[0160] The above problems can be solved through composite structures. For example, an ultra-high molecular weight polymer layer on the inner wall of the pipe can effectively reduce the friction coefficient of the inner wall and improve the problem of algae growth on the inner wall, which affects water quality. Another example is the use of an auxiliary molding layer to improve the molding efficiency of ultra-high molecular weight polyethylene.

[0161] In some embodiments, at least one pipe wall layer further includes: an auxiliary forming layer located between the low-friction layer and the wide-gauge material layer; the auxiliary forming layer is made of a polymer and additives; the low-friction layer is formed by sintering low-friction material powder attached to the auxiliary forming layer near the pipe axis; the low-friction material powder and the auxiliary forming layer in a hot-melt state are co-extruded; the polymer has a molecular weight greater than 1 million, for example, 2 million, 3 million, or 4 million; the thickness of the low-friction layer is less than 30 mm; and 0.03 ≤ M ≤ 0.15, where M is the coefficient of friction. And / or, an outer pipe wall layer exposed on the outer surface of the arc-shaped self-cleaning pipe.

[0162] Molten polymer materials refer to polymer materials that, when heated to above their melting or softening point, transform from a solid state into a fluid liquid state. During this process, the intermolecular forces are partially overcome, allowing the molecular chains to move relatively freely.

[0163] See Figure 43 The diagram shows a partial cross-sectional view of the pipe wall with a two-layer composite structure. The first layer can be an ultra-high molecular weight polyethylene layer, and the second layer can be an auxiliary molding layer. This auxiliary molding layer can also improve the pipe's anti-aging properties, increase its mechanical strength, and reduce material costs.

[0164] For example, the auxiliary forming layer is mainly used to assist in the forming of the low-friction layer. Specifically, the low-friction layer powder is attached to the inner surface of the tubular auxiliary forming layer. The tubular auxiliary forming layer applies traction force (dragging force) or provides support to the low-friction layer powder, rather than applying extrusion force to the molten low-friction layer, effectively reducing the forming difficulties caused by the ultra-high viscosity of the molten low-friction layer material. Specifically, the low-friction layer powder layer can be formed on the auxiliary forming layer by co-extrusion, and then the composite material can be formed by heating. Alternatively, the low-friction layer powder can be formed on the strip-shaped auxiliary forming layer first, then heated to form a composite pipe strip, and then formed into a multi-layer composite pipe through a winding process. Through the above methods, the shortcomings of extrusion molding, compression molding, and winding molding in the prior art can be effectively overcome, and the advantages of various forming methods can be comprehensively utilized to meet the market demand for high-performance and low-cost pipes.

[0165] Figure 44 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 45A A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 45B A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 46 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 47 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 48 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 49 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of walls is shown. (See also...) Figures 44 to 49 The pipe wall may comprise sequentially stacked layers of ultra-high molecular weight polyethylene, auxiliary molding, and an outer wall layer. It should be noted that... (See also...) Figure 45A and Figure 45B The inner and outer walls of the pipe can be conformal or non-conformal. For example, the outer walls of the top of the first opening and the bottom of the second opening are approximately flat to facilitate the pipe standing on the mounting surface and increase strength.

[0166] In some embodiments, to improve the seismic performance and mechanical strength of the pipe without significantly increasing the cost of raw materials, the arc-shaped self-cleaning pipe may also have a variety of material layers. Specifically, the maximum cross-sectional dimension of the arc-shaped self-cleaning pipe is greater than or equal to 200 mm, such as 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 1000 mm, 1500 mm, 2000 mm, 2500 mm, and 3000 mm, to meet users' needs for large-diameter pipes.

[0167] Accordingly, at least one pipe wall layer also includes a wide-gauge material layer disposed on the side of the low-friction layer away from the pipe axis, wherein the thickness of the wide-gauge material layer is greater than 50% of the wall thickness of the arc-shaped self-cleaning pipe. For example, the ratio of the thickness of the wide-gauge material layer to the wall thickness of the arc-shaped self-cleaning pipe can be: 50%, 55%, 60%, 65%, 68%, 70%, 75%, 80%, 85%, 90%, etc.

[0168] Figure 50 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 51 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 52 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of pipe wall is shown. Figure 53 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with three layers of walls is shown. (See also...) Figures 50 to 53 The pipe wall may include layers of ultra-high molecular weight polyethylene, wide-gauge polymer, and outer wall layer stacked in sequence.

[0169] In some embodiments, the pipe wall may also be a four-layer composite structure.

[0170] Figure 54 This diagram shows a partial cross-sectional view of the four layers of the arc-shaped self-cleaning pipe wall. (See also...) Figure 54 The composite structure wall has a four-layer composite structure with cross-sections of A1-B-A2-C. Among them, layers A1 and A2 are polymer and modified polymer material layers, layer B is a polymer and modified foaming material layer, and layer C is a modified ultra-high molecular weight polyethylene material layer.

[0171] The C-layer is a modified ultra-high molecular weight polyethylene material layer. The friction coefficient of the modified C-layer is between 0.01 and 0.15, preferably between 0.03 and 0.14. The modified powder composition includes: ultra-high molecular weight powder with a molecular weight of more than 1 million and antioxidants. For example, the molecular weight of the ultra-high molecular weight powder can be 2 million, 3 million, or 4 million, etc.

[0172] Figure 55 A three-dimensional schematic diagram of an arc-shaped self-cleaning pipe with four layers of pipe wall is shown. Figure 56 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with four layers of pipe wall is shown. Figure 57 A three-dimensional schematic diagram of another type of arc-shaped self-cleaning pipe with four layers of pipe wall is shown. Figure 58 A three-dimensional schematic diagram of another arc-shaped self-cleaning pipe with four layers of wall is shown. See also Figures 55 to 58 The four-layer composite pipe wall can be used to form various arc-shaped self-cleaning pipes. For example, the first opening structure 1 can be an arc shape or a polygon or a combination thereof. The second opening structure 2 can be an arc shape and has a convex shape 21 and a concave shape 22. The connecting structure 3 can be a straight surface or a curved surface slightly bent towards the pipe axis. The specific shape of the arc-shaped self-cleaning pipe cross-section can be found in the above-mentioned related embodiments, and will not be described in detail here.

[0173] The following provides illustrative examples of the specific shapes and structures of the pipes. Table 1 shows some examples of single-walled pipes.

[0174] Table 1

[0175]

[0176] For example, for single-layer solid-wall pipes, as shown in Table 1, the material with a wall thickness of E1 is composed of polymer materials and their modified materials, preferably one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC).

[0177] When the pipe is a specially shaped pipe with self-cleaning function, the internal flow channel shape of the pipe in the installed state consists of three parts: a first opening, a second opening, and a connecting structure. Each structure and its connection points are rounded. The shapes of the first and second openings correspond to specific projected areas in cross-section, with the area of ​​the first opening being larger than that of the second opening. Pipes with the above-mentioned internal flow channel characteristics include: two-layer pipe walls, three-layer pipe walls, and four-layer pipe walls, etc.

[0178] For pipes with two composite walls, as shown in Table 2, the auxiliary molding layer with a wall thickness of E3 is composed of polymer materials and their modified materials, such as one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC); the low-friction layer with a wall thickness of E4 is composed of ultra-high molecular weight polyethylene and its modified materials, preferably ultra-high molecular weight polyethylene powder directly molded; the molding process is assisted by the auxiliary molding layer; the friction coefficient of the low-friction layer of the ultra-high molecular weight polyethylene layer after molding is controlled to be 0.13.

[0179] For example, the auxiliary molding layer with a wall thickness of E3 is composed of polymer materials and their modified materials, preferably one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC); for example, if the auxiliary molding layer material is polypropylene (PP), it is plasticized by an extruder during molding, and the melt temperature of the extrudate is 290°C, which is used to melt and adhere ultra-high molecular weight polyethylene powder in order to form a low friction layer.

[0180] The material with a low-friction layer wall thickness of E4 is composed of ultra-high molecular weight polyethylene (UHMWPE) and its modified materials. For example, UHMWPE powder can be directly formed through an auxiliary forming layer. Alternatively, when it is spirally wound after being assisted by the auxiliary forming layer and heated using microwaves during the pressing process, the material composition can be: 100 parts UHMWPE powder, 5 parts carbon black, 1 part water, and 1 part silicone oil. Through the matrix properties of UHMWPE, the reinforcement and functionalization of carbon black, the lubrication of silicone oil, and the processing assistance of water, multiple optimizations in mechanical properties, processing performance, and functional characteristics are achieved, making it suitable for the field of high-performance engineering plastics.

[0181] Table 2

[0182]

[0183]

[0184] In one embodiment, for a three-layer pipe, as shown in Table 3, the outermost layer with a wall thickness of E1 is composed of a polymer material and its modified materials, such as one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC); the auxiliary molding layer with a wall thickness of E3 is composed of a polymer material and its modified materials, such as one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC); the low-friction layer with a wall thickness of E4 is composed of ultra-high molecular weight polyethylene and its modified materials, preferably ultra-high molecular weight polyethylene powder is directly molded, and the molding process is assisted by the auxiliary molding layer; the friction coefficient of the molded ultra-high molecular weight polyethylene layer is controlled to be 0.12.

[0185] Table 3

[0186]

[0187]

[0188] In one specific embodiment, the composite structure wall has a four-layer composite structure with a cross-section of A1-B-A2-C. Among them, layers A1 and A2 are polymer and modified polymer material layers, layer B is a polymer and modified foaming material layer, and layer C is a modified ultra-high molecular weight polyethylene material layer.

[0189] The C-layer is a modified ultra-high molecular weight polyethylene layer. The friction coefficient of the modified C-layer is between 0.01 and 0.15, preferably between 0.03 and 0.14. The modified powder composition is: ultra-high molecular weight powder with a molecular weight of 2 million, 3 million, or 4 million or more, low-density linear polyethylene powder, and antioxidant. Table 4 shows some structural examples of four-layer pipe materials.

[0190] Table 4

[0191]

[0192] In one embodiment, for a four-layer pipe, as shown in Table 4, the outermost layer with a wall thickness of E1 is composed of a polymer material and its modified forms, preferably one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC); the wide-gauge polymer layer with a wall thickness of E2 is composed of a polymer and its modified foaming material, preferably one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC), such as using 100 parts HDPE, 10 parts calcium powder, and 5 parts foaming agent, extruded and foamed, resulting in a material density of 0.95 g / cm³ after foaming. 3 The average pore diameter is 90 micrometers, and the pore density is 1.9 × 10⁻⁶. 7 pcs / cm 3 The auxiliary molding layer with a wall thickness of E3 is composed of polymer materials and their modified materials, preferably one or a combination of high-density polyethylene (HDPE), polypropylene (PP), and polyvinyl chloride (PVC); the low friction layer with a wall thickness of E4 is composed of ultra-high molecular weight polyethylene and its modified materials, preferably ultra-high molecular weight polyethylene powder directly molded, with the auxiliary molding layer assisting in the molding process; the friction coefficient of the molded ultra-high molecular weight polyethylene layer is controlled to be 0.14.

[0193] In some embodiments, the stress analysis of various pipe materials in this invention is performed using the finite element method. The stress on the pipe materials is as follows: Figure 59 As shown. Figure 59 A schematic diagram showing the loading force on the pipe is provided.

[0194] Finite element analysis description: All analyzed products are single-layer solid-wall pipes with a wall thickness of 29.7mm and a pipe length of 700mm. The pipe material is HDPE. Comparative analyses were conducted on circular solid-wall pipes, published egg-shaped pipes, and the self-cleaning pipe examples provided in this patent. For example, in Table 1, the pipe with a height H of 600mm is shown. The external force applied to the pipe is F = 15 tons. The loading diagram is shown below. Figure 59 As shown.

[0195] For a conventional circular pipe, the stress-deformation analysis results show that the pipe gradually transforms into an elliptical shape, and the flow channel inside the pipe deforms outward from the center of the pipe.

[0196] For egg-shaped pipes, stress-deformation analysis results show that as the pipe gradually shortens, the convex arc of the inner flow channel in the middle of the pipe deforms outward from the center of the pipe, the radius of the bottom arc gradually increases, and the self-cleaning effect gradually fails.

[0197] Taking the pipe in Table 1 with a height H of 600, an arc-shaped first opening, and a slanted straight edge connection structure as an example, the stress-deformation analysis results show that as the pipe gradually decreases in height, part of the inner flow channel connection structure in the middle of the pipe deforms inward towards the center of the pipe, and the self-cleaning effect does not fail.

[0198] For the pipe in Table 1 with a height H of 600, a first opening that is an arc, and a connecting structure that is an inwardly concave arc, the stress-deformation analysis results show that as the pipe gradually decreases in height, a large portion of the inner flow channel connecting structure in the middle of the pipe deforms inward toward the center of the pipe, and the self-cleaning effect does not fail.

[0199] Taking the pipe with a height H of 600mm in Table 1, an initial opening consisting of two straight edges and an arc, and a connecting structure with a beveled straight edge as an example, the stress-deformation analysis results show that as the pipe gradually decreases in height, part of the inner flow channel connecting structure in the middle of the pipe deforms inward towards the center of the pipe, and the self-cleaning effect does not fail. Simultaneously, the initial opening with two straight edges and an arc provides support, resulting in a higher pipe strength compared to the pipe with an initial opening of a single arc and a connecting structure with a beveled straight edge.

[0200] Taking the pipe with a height H of 600mm in Table 1, a first opening with three straight edges, and a connecting structure with beveled straight edges as an example, the stress-deformation analysis results show that as the pipe gradually decreases in height, part of the inner flow channel connecting structure in the middle of the pipe deforms inward towards the center of the pipe, and the self-cleaning effect does not fail. At the same time, the first opening with three straight edges provides support, resulting in higher pipe strength compared to the pipe with a first opening of an arc and a connecting structure with beveled straight edges.

[0201] In some embodiments, test results of resistance to gravity deformation of single-walled and four-walled pipes are shown as examples.

[0202] The wide-specification polymer layer uses micro-foamed material, which effectively improves the pipe's resistance to gravity deformation. The resistance to gravity deformation of single-layer solid-wall pipes and four-layer composite-wall pipes were compared. As shown in Table 5, the wall thickness E1 of the single-layer pipe is made of high-density polyethylene (HDPE); the four-layer pipe with a wide-specification polymer layer has an outer layer wall thickness of E1 made of high-density polyethylene (HDPE); the wide-specification polymer layer wall thickness E2 is made of high-density polyethylene (HDPE) foamed material, such as 100 parts HDPE, 10 parts calcium powder, and 5 parts foaming agent, extruded and foamed, with a post-foaming material density of 0.95 g / cm³. 3 The average pore diameter is 90 micrometers, and the pore density is 1.9 × 10⁻⁶. 7 pcs / cm 3 The auxiliary molding layer with a wall thickness of E3 is made of high-density polyethylene (HDPE); the low-friction layer with a wall thickness of E4 is made of ultra-high molecular weight polyethylene. Table 5 shows the results of gravity deformation resistance of the pipes using the above structure and materials.

[0203] Table 5

[0204]

[0205] The above comparison shows that when single-layer pipes and four-layer composite pipes have the same wall thickness, the four-layer composite pipes have stronger resistance to gravity deformation.

[0206] The following provides an illustrative example of the actual effect of the self-cleaning function of the aforementioned pipes.

[0207] This patent relates to experiments conducted on pipes with self-cleaning internal flow channels. Pipe specifications are shown in Tables 6 and 7 below, with the corresponding pipes categorized into single-layer solid-wall pipes and multi-layer composite pipes. Each type of pipe has four different internal flow channels. The corresponding internal flow channel height H is 600mm. The first opening of the pipe uses a single circular arc design, the second opening uses a single circular arc and three circular arcs, and the connection structure uses a slanted straight edge or an inwardly concave circular arc. Combinations of these three structures result in four different self-cleaning capabilities. Furthermore, for the multi-layer composite pipes, the innermost layer is a low-friction layer E4 of ultra-high molecular weight polyethylene, corresponding to different friction coefficients. Table 6 shows the single-layer solid-wall pipe material as HDPE. Table 7 shows the multi-layer composite pipe material, with the outermost layer E1 being HDPE, the wide-gauge polymer layer E2 being HDPE microporous foam material, the auxiliary molding layer E3 being HDPE, and the low-friction layer E4 being ultra-high molecular weight polyethylene.

[0208] During the experiment, the self-cleaning pipes were spliced ​​together to a length of 30 meters. Bases were installed at the bottom of the pipes to ensure they did not tilt laterally. The pipes were installed at a 2° tilt angle, and the highest point of the laid pipes was connected to a large water tank. Silt, leaves, branches, and water were mixed in the large water tank. Two water levels were used during the experiment: 120 mm (0.2H) and 420 mm (0.7H). Water flowed naturally from the large water tank into the corresponding pipes. After 10 minutes of drainage, the deposition of solid foreign matter inside the pipes was observed. The results showed that from the drainage inlet to the drainage outlet (within 30 meters), silt was deposited to varying degrees at the bottom of the pipes, and branches and leaves were suspended inside the pipes to varying degrees. The specific conditions for each pipe type are shown in Tables 6 and 7.

[0209] Table 6

[0210]

[0211]

[0212] Table 7

[0213]

[0214]

[0215] In another embodiment, a flushing experiment was conducted on the sediment inside the pipes from the above embodiment. During the experiment, the large water tank contained only water, free of visible silt, leaves, branches, or other foreign objects. Two water depths were used during the experiment: 120 mm (0.2H) and 420 mm (0.7H). Water flowed naturally from the large water tank into the corresponding pipes. After 5 minutes of drainage, the cleanliness of the original solid sediment was observed. The results showed that from the drainage inlet to the drainage outlet (within 30 meters), the silt at the bottom of the pipes was cleaned to varying degrees, especially in multi-layer composite wall pipes with an ultra-high molecular weight polyethylene inner layer, where the original solid sediment was almost completely cleaned. Examples of single-layer solid wall pipe specifications are shown in Table 8, and examples of multi-layer composite pipe specifications are shown in Table 9.

[0216] Table 8

[0217]

[0218]

[0219] Table 9

[0220]

[0221]

[0222] The arc-shaped self-cleaning pipe provided by this utility model has a first cross-sectional area larger than a second cross-sectional area. The first cross-sectional area is the area of ​​the half-section of the arc-shaped self-cleaning pipe on the side furthest from the Earth's center after installation, and the second cross-sectional area is the area of ​​the half-section of the arc-shaped self-cleaning pipe on the side closest to the Earth's center after installation. Therefore, at a certain time point, the flow velocity of the liquid in the first cross-sectional area is less than the flow velocity of the liquid in the second cross-sectional area, that is, the flow velocity of the liquid at the bottom of the arc-shaped self-cleaning pipe is higher than the flow velocity of the liquid in the middle of the arc-shaped self-cleaning pipe. A special mechanical structure accelerates the liquid at the bottom of the pipe, flushing away contaminants deposited and attached to the bottom of the pipe.

[0223] The composite pipe system for improving clogging provided by this utility model can effectively reduce the risk of clogging and reduce maintenance and / or repair costs compared with existing pipe systems.

[0224] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An arc-shaped self-cleaning pipe, comprising at least one pipe wall, characterized in that, The cross-section of one layer of the wall of the arc-shaped self-cleaning pipe includes: The first opening structure, when the arc-shaped self-cleaning pipe is laid, is located on the side of the arc-shaped self-cleaning pipe away from the Earth's center. The second opening structure, when the arc-shaped self-cleaning pipe is laid, is located on the side of the arc-shaped self-cleaning pipe closer to the Earth's center. A connecting structure is provided, wherein the first opening structure is connected to the second opening structure through the connecting structure, and together they form a closed shape; Wherein, the first projected area is greater than the second projected area, the first projected area is the projected area of ​​the closed region of the first opening structure on the cross section, and the second projected area is the projected area of ​​the closed region of the second opening structure on the cross section.

2. The arc-shaped self-cleaning pipe according to claim 1, characterized in that: The first opening structure is a horizontally symmetrical structure; The second opening structure is a horizontally symmetrical structure; The connection structure includes two horizontally symmetrical and separately arranged sub-connection structures, with each sub-connection structure having its two ends connected to one end of the first opening structure and the corresponding end of the second opening structure, respectively.

3. The arc-shaped self-cleaning pipe according to claim 2, characterized in that: The first opening structure is any one or a combination of a circular arc structure, an elliptical arc structure, and a polygonal opening structure. The second opening structure is any one of a circular arc structure, an elliptical arc structure, a polygonal opening structure, or a combination thereof.

4. The arc-shaped self-cleaning pipe according to claim 3, characterized in that: The opening size of the second opening structure is smaller than the opening size of the first opening structure; The edges of the polygonal opening structure are connected with rounded corners.

5. The arc-shaped self-cleaning pipe according to claim 1, characterized in that: The second opening structure includes at least one concave shape facing the first opening, with liquid flow acceleration structures formed on both sides of the concave shape; and / or The second opening structure includes at least one protruding shape in a direction away from the first opening, the protruding shape forming a liquid flow acceleration structure.

6. The arc-shaped self-cleaning pipe according to claim 5, characterized in that: The ratio of the size of the concave opening to the size of the first opening is less than 50%. The ratio of the opening size of the protruding shape to the opening size of the first opening is less than 50%.

7. The arc-shaped self-cleaning pipe according to claim 1, characterized in that, After installation, the wall of at least one side of the arc-shaped self-cleaning pipe retains its shape or deforms toward the axis of the arc-shaped self-cleaning pipe.

8. The arc-shaped self-cleaning pipe according to claim 1, characterized in that, The connection structure includes a first sub-connection structure and a second sub-connection structure; The first sub-connecting structure and the second sub-connecting structure are straight structures or curved structures that bend toward each other. When the arc-shaped self-cleaning pipe is subjected to external force, the distance between the first sub-connecting structure and the second sub-connecting structure is at least partially reduced.

9. The arc-shaped self-cleaning pipe according to claim 1, characterized in that: At least one layer of the pipe wall near the axis of the pipe is a low-friction layer, and the friction coefficient of the low-friction layer is <0.15; The low-friction layer is an ultra-high molecular weight polymer layer.

10. The arc-shaped self-cleaning pipe according to claim 1, characterized in that, The arc-shaped self-cleaning pipe also includes: The support structure is located on the side of the second opening structure closest to the Earth's center when the arc-shaped self-cleaning pipe is laid. The supporting structure is integrally formed with the second opening structure, or the supporting structure is fixed to the second opening structure after the second opening structure is formed.

11. The arc-shaped self-cleaning pipe according to claim 10, characterized in that: The support structure includes a first sub-support structure and a second sub-support structure, which are respectively disposed on both sides of the second opening structure; or The support structure includes a grounding component and a connecting component. The grounding component is an inclined surface or a surface with a preset curvature, the preset curvature being less than the curvature of the second opening structure. The two ends of the connecting component are respectively connected to the grounding component and the first opening structure.

12. The arc-shaped self-cleaning pipe according to claim 1, characterized in that, At least one layer of the pipe wall further includes: A wide-gauge material layer is disposed on the side of the low-friction layer away from the axis of the pipe, and the ratio of the thickness of the wide-gauge material layer to the wall thickness of the arc-shaped self-cleaning pipe is greater than 50%.

13. The arc-shaped self-cleaning pipe according to claim 12, characterized in that, At least one layer of the pipe wall further includes: An auxiliary forming layer, located between the low-friction layer and the wide-gauge material layer, is made of a polymer and additives. The low-friction layer is formed by sintering low-friction material powder attached to the auxiliary forming layer on the side near the axis of the tube. The low-friction material powder and the auxiliary forming layer in a hot-melt state are co-extruded. The polymer has a molecular weight greater than 1 million, the low-friction layer has a thickness of less than 30 mm, and the coefficient of friction is 0.03 ≤ M ≤ 0.

15. The outer layer of the pipe wall is exposed on the outer surface of the arc-shaped self-cleaning pipe.

14. The arc-shaped self-cleaning pipe according to claim 1, characterized in that, The arc-shaped self-cleaning pipe can be any of the following structures: The arc-shaped self-cleaning pipe is a double-walled corrugated pipe, which includes a first pipe wall and a second pipe wall, with the first pipe wall located on the side of the second pipe wall closer to the axis of the pipe. The arc-shaped self-cleaning pipe is a single-wall corrugated pipe; The arc-shaped self-cleaning pipe is a spiral wound pipe; The arc-shaped self-cleaning pipe is a special-shaped pipe; The arc-shaped self-cleaning pipe is a single-layer solid wall pipe and / or a multi-layer solid wall pipe.

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